Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9ce71fa8e15c30…

MALICIOUS

PDF

787.9 KB First seen: 2026-05-04
MD5: ae52908370dcdf6c150b6e2ad3d8b11b SHA-1: f4a3ed4c33fc2aa748946b769cdcee10682fe27c SHA-256: 5b9ce71fa8e15c3001c89a7edcb26917a95889727a093bff9ffbc566e15aaef6
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document utilizes XFA forms and JavaScript to conceal its malicious content, as indicated by the PDF_ENCRYPTED_WITH_JS heuristic. The embedded JavaScript stream is a strong indicator of malicious intent, likely to download and execute a second-stage payload. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Dropper.Agent-1847194 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-1847194
  • Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/OpenAction). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/ In extracted file (stream_000_off0006d7f3.js)
    • http://www.xfa.org/schema/xci/3.0/In extracted file (stream_000_off0006d7f3.js)
    • http://www.xfa.org/schema/xfa-template/2.8/In extracted file (stream_000_off0006d7f3.js)
    • http://www.xfa.org/schema/xfa-data/1.0/In extracted file (stream_000_off0006d7f3.js)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_000_off0006d7f3.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6D7F3 289498 bytes
SHA-256: dcefc16710d335e69f60cdd8a0e174d43939d02eaa8dd4c6d7ce4ca63f06495b

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